2009

world origin (0,0,0). When animated, the operator icon's motion is imparted
to the particles. If you delete the icon, the software also deletes the operator.
NOTE If you add Speed By Icon from the Create panel, Particle Flow creates a
separate event for the operator in the particle diagram.
WARNING If you delete a Speed By Icon operator icon in the viewport, you also
delete the corresponding operator in the Particle Flow system.
See also:
■
Speed Operator on page 2871
■ Speed By Surface Operator on page 2886
■
Keep Apart Operator on page 2894
Procedures
To use the Speed By Icon operator:
1 Add a Speed By Icon operator to an event. Be sure to add it after any
existing Speed operators in the event. Alternatively, delete or turn off
any existing Speed operators.
The Speed By Icon operator icon appears at the world origin (0,0,0).
2 Animate the icon as you would any object. You can do this manually, or
with a controller such as Path Constraint. See the following procedure
for an example of this.
The particles' motion is now under the influence of the animated icon.
3 Set the Speed By Icon parameters. With the icon selected, you can do this
in the Modify panel.
In general, the default Icon Animation > Sync By setting, Event Duration,
works best. It causes the icon animation to be applied to the particles
within the time frame of the event containing the Speed By Icon operator.
Example: To send particles along a path:
1 Reset the software, and then add a Particle Flow system in the Perspective
viewport.
Particle Flow | 2877